Maytag Dryer: High Limit Thermostat Keeps Blowing -... | appliancefaults.com

Technical Background:

The MCU (Main Control Unit) in a dryer controls the heating element based on temperature readings from the operating and high limit thermostats. If airflow is restricted or the operating thermostat fails, the high limit thermostat trips to prevent overheating. The high limit thermostat is a safety device that opens the circuit to the heating element at a specific temperature (typically around 250-275°F). Repeated failures indicate an underlying issue causing excessive heat buildup.

Symptoms:

US homeowner reports that the high limit thermostat on their Maytag dryer fails approximately every month.

Possible Causes:

Restricted exhaust vent
Clogged lint filter or lint screen housing
Faulty blower motor
Heating element shorted to the housing
Defective operating thermostat
Blocked air intake

Solution:

1

Unplug the dryer from the outlet and ensure Lock-Out/Tag-Out (LOTO) is applied.
2

Disconnect the exhaust vent from the dryer.
3

Using a multimeter, check the heating element for shorts to the dryer housing. Resistance between the element terminals and the housing should be infinite (OL).
4

Verify the operating thermostat is cycling correctly. It should read continuity when cold and open when heated.
5

Inspect the blower wheel for obstructions or damage.
6

Check the voltage to the heating element when the dryer is running. It should be approximately 240V AC.
7

Ensure the lint duct and blower housing are clear of lint accumulation.

Safety Warning:

Disconnect power to the dryer at the breaker panel before performing any repairs. Dryer circuits carry 240V AC, which can cause serious injury or death. Always apply Lock-Out/Tag-Out (LOTO) procedures.

Prevention:

• Clean the lint filter after every load.
• Inspect and clean the exhaust vent at least once a year.
• Ensure the dryer has adequate airflow around it.
• Check and clean the lint screen housing regularly.

Expert Tip:

Many Maytag dryers have a diagnostic mode. Typically, pressing and holding the Start/Pause and End of Cycle signal buttons simultaneously for 3 seconds will enter the diagnostic mode. Consult the service manual for your specific model to retrieve any stored error codes.

Frequently Asked Questions

•How do I test the operating thermostat?

The operating thermostat should have continuity when at room temperature. Use a multimeter to check for continuity. Then, use a heat gun or hair dryer to gently heat the thermostat. The continuity should break (open circuit) at its rated temperature. If it doesn't cycle properly, replace it.

•What size is the dryer vent, and how do I properly clean it?

Dryer vents are typically 4 inches in diameter. Use a dryer vent cleaning kit, available at most hardware stores. Disconnect the vent from both the dryer and the wall, and use the brush and flexible rods to remove lint buildup. Ensure there are no kinks or sharp bends in the vent.

•How do I access the heating element in my Maytag dryer?

Typically, you'll need to disconnect power and then remove the rear panel of the dryer. The heating element housing will be visible. Remove the screws securing the housing, and then carefully pull out the heating element assembly. Be cautious of sharp edges and ensure the element is cool before handling.

Maytag Dryer: High Limit Thermostat Keeps Blowing - Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I test the operating thermostat?

•What size is the dryer vent, and how do I properly clean it?

•How do I access the heating element in my Maytag dryer?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: